3681389 has 4 divisors (see below), whose sum is σ = 3780924. Its totient is φ = 3581856.

The previous prime is 3681373. The next prime is 3681407. The reversal of 3681389 is 9831863.

3681389 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2778889 + 902500 = 1667^2 + 950^2 .

It is a cyclic number.

It is not a de Polignac number, because 3681389 - 2⁴ = 3681373 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3681319) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 49712 + ... + 49785.

It is an arithmetic number, because the mean of its divisors is an integer number (945231).

Almost surely, 2^3681389 is an apocalyptic number.

It is an amenable number.

3681389 is a deficient number, since it is larger than the sum of its proper divisors (99535).

3681389 is an equidigital number, since it uses as much as digits as its factorization.

3681389 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 99534.

The product of its digits is 31104, while the sum is 38.

The square root of 3681389 is about 1918.6946083210. The cubic root of 3681389 is about 154.4082746109.

The spelling of 3681389 in words is "three million, six hundred eighty-one thousand, three hundred eighty-nine".